Fast decay of a three-particle isomer in 171Tm
Walker, P.M., Wood, R.J., Dracoulis, G.D., Kibédi, T., Bark, R.A., Bruce, A.M., Byrne, A.P., Davidson, P.M., El-Masri, H.M., Lane, G.J., Moon, C., Orce, J.N., Prados Estevéz, F.M., Wheldon, C. and Wilson, A.N. (2009) Fast decay of a three-particle isomer in 171Tm Physical Review C, 79 (4). ISSN 1089-490X
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Official URL: http://prc.aps.org/abstract/PRC/v79/i4/e044321
Incomplete-fusion reactions have been used to study high-spin states in 171Tm. Gamma rays and conversion electrons were measured using pulsed-beam conditions for enhanced isomer sensitivity. A Kπ=19/2+, three-quasiparticle isomer was identified, with a half-life of 1.7(2) µs. The faster than expected transition rates from the isomer can be understood as being due to a chance near-degeneracy, with mixing between the isomeric state and the Iπ=19/2+ member of the one-quasiparticle rotational bands to which it decays. The implied mixing matrix element is 12(2) eV.
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